com.amazonaws.metrics.internal.cloudwatch.spi.RequestMetricTransformer Maven / Gradle / Ivy
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/*
* Copyright 2010-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.metrics.internal.cloudwatch.spi;
import java.util.Date;
import java.util.List;
import com.amazonaws.Request;
import com.amazonaws.Response;
import com.amazonaws.metrics.MetricType;
import com.amazonaws.services.cloudwatch.model.MetricDatum;
import com.amazonaws.util.TimingInfo;
/**
* Internal SPI used to provide custom request metric transformer that can be
* added to or override the default AWS SDK implementation. Implementation of
* this interface should ensure the {@link Object#equals(Object)} and
* {@link Object#hashCode()} methods are overridden as necessary.
*/
public interface RequestMetricTransformer {
/**
* Returns a list of metric datum for the metrics collected for the given
* request/response, or null if this transformer does not recognize the
* specific input metric type.
*
* Note returning an empty list means the transformer recognized the metric
* type but concluded there is no metrics to be generated for it.
*
* @param metricType
* the predefined metric type
*/
public List toMetricData(MetricType metricType,
Request request, Response response);
/** A convenient instance of a no-op request metric transformer. */
public static final RequestMetricTransformer NONE = new RequestMetricTransformer() {
public List toMetricData(MetricType requestMetric,
Request request, Response response) {
return null;
}
};
/** Common utilities for implementing this SPI. */
public static enum Utils {
;
public static long endTimeMilli(TimingInfo ti) {
Long endTimeMilli = ti.getEndEpochTimeMilliIfKnown();
return endTimeMilli == null ? System.currentTimeMillis() : endTimeMilli.longValue();
}
public static Date endTimestamp(TimingInfo ti) {
return new Date(endTimeMilli(ti));
}
}
}